List of Consulting Firms
http://www.wikijob.co.uk/wiki/list-consulting-firms
List of management consulting firms
http://en.wikipedia.org/wiki/List_of_management_consulting_firms
List of IT consulting firms
http://en.wikipedia.org/wiki/List_of_IT_consulting_firms
List of top consulting firms
http://www.stormscape.com/inspiration/website-lists/consulting-firms/